linux-kernel - Re: [patch 1/3] x86/msi: Make irq_retrigger() functional for posted MSI

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Message-ID: <87ldjugchs.ffs@tglx>
Date: Tue, 25 Nov 2025 20:04:31 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Luigi Rizzo <lrizzo@...gle.com>
Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
 stable@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel
 <joro@...tes.org>
Subject: Re: [patch 1/3] x86/msi: Make irq_retrigger() functional for posted
 MSI

On Tue, Nov 25 2025 at 18:54, Luigi Rizzo wrote:
> On Tue, Nov 25, 2025 at 11:20 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>>
>> Luigi reported that retriggering a posted MSI interrupt does not work
>> correctly.
>> [...]
>>
>> So instead of playing games with the PIR, this can be actually solved
>> for both cases by:
>>
>>  1) Keeping track of the posted interrupt vector handler state
>
> Tangential comment, but I see that this patch uses this_cpu_read()/write()
> whereas the rest of the file uses __this_cpu_read()/write()

You're right. I've missed that. Let me redo it.